Cosmetics Products Analysis

I want to know how to calculate percentage What do you think about putting it on? Thank you.

Hello, % of ingredients is equal to the proportion of components in the formula. For example, Water 90%, skin nourishment 10%. When mixed with 100 grams of formula, it means 90 grams of water (90% x 100 grams), 10 grams of skin care substance. (10 % x 100g)